I've speculated (rather wildly) that Ethereum POS will never come. I potentially see POS just as something that is discussed openly to deter ASIC development. Also, POW mining loosely underpins the value of the cryptos being mined. If Ethereum ever actually does switch to POS, I think it will hurt valuation of the coin, and other coins will benefit.
This remains to be seen,the developer team of eth just wants the best to eth and their supporters by going to pos they can get people to adopt and hold their coin to their wallet not every one can mine eth but every body can do pos,I'd like to see the scenario after this .